How to determine the page size of the site in px?

Question

css

Actually I go to the site, how to determine the page size (length and width) in order to immediately make a layout with the same dimensions in Photoshop? Thanks

Answer 1

Take a screenshot
Paste it into Photoshop
Measure
Profit

Answer 2

in chrome ctrl+shift+i
hover over an element, its size appears on the screen

Answer 3

Usually, on the contrary, the layout follows the layout. Do 1000px you won't go wrong